```html
<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>JSON4U.cn - 专业JSON数据处理平台</title>
    <link href="https://cdn.staticfile.org/font-awesome/6.4.0/css/all.min.css" rel="stylesheet">
    <link href="https://cdn.staticfile.org/tailwindcss/2.2.19/tailwind.min.css" rel="stylesheet">
    <link href="https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;500;600;700&family=Noto+Sans+SC:wght@300;400;500;700&display=swap" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/mermaid@latest/dist/mermaid.min.js"></script>
    <style>
        body {
            font-family: 'Noto Sans SC', Tahoma, Arial, Roboto, "Droid Sans", "Helvetica Neue", sans-serif;
            background-color: #f8fafc;
            color: #1e293b;
        }
        .hero-gradient {
            background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #d946ef 100%);
        }
        .card-hover {
            transition: all 0.3s ease;
        }
        .card-hover:hover {
            transform: translateY(-5px);
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
        }
        .feature-icon {
            width: 64px;
            height: 64px;
            background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
        }
        .highlight {
            position: relative;
            z-index: 1;
        }
        .highlight::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 30%;
            background-color: rgba(99, 102, 241, 0.2);
            z-index: -1;
            transform: skewY(-2deg);
        }
        .drop-cap::first-letter {
            font-size: 4.5em;
            font-weight: 700;
            float: left;
            line-height: 0.8;
            margin-right: 0.2em;
            color: #6366f1;
            font-family: 'Noto Serif SC', serif;
        }
    </style>
</head>
<body>
    <!-- Hero Section -->
    <section class="hero-gradient text-white py-20">
        <div class="container mx-auto px-6">
            <div class="flex flex-col lg:flex-row items-center">
                <div class="lg:w-1/2 mb-12 lg:mb-0">
                    <h1 class="text-4xl md:text-5xl lg:text-6xl font-bold mb-6 leading-tight">释放JSON数据的全部潜力</h1>
                    <p class="text-xl mb-8 text-indigo-100 max-w-lg">为开发者打造的终极JSON处理平台，提供格式化、可视化、转换和比较功能，让数据操作从未如此简单。</p>
                    <div class="flex flex-col sm:flex-row gap-4">
                        <a href="https://json4u.cn/editor" class="bg-white text-indigo-600 hover:bg-indigo-50 px-8 py-4 rounded-lg font-semibold text-lg shadow-lg transition duration-300 transform hover:scale-105">
                            <i class="fas fa-play mr-2"></i> 立即体验
                        </a>
                        <a href="#features" class="border-2 border-white text-white hover:bg-white hover:text-indigo-600 px-8 py-4 rounded-lg font-semibold text-lg transition duration-300">
                            <i class="fas fa-info-circle mr-2"></i> 了解更多
                        </a>
                    </div>
                </div>
                <div class="lg:w-1/2 flex justify-center">
                    <img src="https://cdn.nlark.com/yuque/0/2025/png/21449790/1754972175716-18b37691-22bf-4042-9d0d-929cc03c1772.png" alt="JSON4U界面截图" class="rounded-xl shadow-2xl border-8 border-white max-w-full h-auto">
                </div>
            </div>
        </div>
    </section>

    <!-- Problem Section -->
    <section class="py-20 bg-white">
        <div class="container mx-auto px-6">
            <div class="text-center mb-16">
                <h2 class="text-3xl md:text-4xl font-bold mb-4">JSON处理的痛点与解决方案</h2>
                <div class="w-24 h-1 bg-indigo-500 mx-auto"></div>
            </div>
            
            <div class="grid md:grid-cols-2 gap-10">
                <div class="bg-gray-50 p-8 rounded-xl">
                    <h3 class="text-2xl font-bold mb-4 text-indigo-600">常见问题</h3>
                    <ul class="space-y-4">
                        <li class="flex items-start">
                            <i class="fas fa-exclamation-circle text-red-500 mt-1 mr-3"></i>
                            <span>手动格式化JSON耗时且易出错</span>
                        </li>
                        <li class="flex items-start">
                            <i class="fas fa-exclamation-circle text-red-500 mt-1 mr-3"></i>
                            <span>复杂嵌套结构难以快速理解</span>
                        </li>
                        <li class="flex items-start">
                            <i class="fas fa-exclamation-circle text-red-500 mt-1 mr-3"></i>
                            <span>传统文本对比工具难以直观呈现结构变化</span>
                        </li>
                        <li class="flex items-start">
                            <i class="fas fa-exclamation-circle text-red-500 mt-1 mr-3"></i>
                            <span>缺乏实时验证工具，调试API响应困难</span>
                        </li>
                        <li class="flex items-start">
                            <i class="fas fa-exclamation-circle text-red-500 mt-1 mr-3"></i>
                            <span>功能单一，需切换多个平台完成任务</span>
                        </li>
                    </ul>
                </div>
                
                <div class="bg-indigo-50 p-8 rounded-xl">
                    <h3 class="text-2xl font-bold mb-4 text-indigo-600">JSON4U的解决方案</h3>
                    <ul class="space-y-4">
                        <li class="flex items-start">
                            <i class="fas fa-check-circle text-green-500 mt-1 mr-3"></i>
                            <span>一键格式化JSON，自动校验语法错误</span>
                        </li>
                        <li class="flex items-start">
                            <i class="fas fa-check-circle text-green-500 mt-1 mr-3"></i>
                            <span>图形与表格视图直观展示嵌套结构</span>
                        </li>
                        <li class="flex items-start">
                            <i class="fas fa-check-circle text-green-500 mt-1 mr-3"></i>
                            <span>高级结构化比较，快速定位差异</span>
                        </li>
                        <li class="flex items-start">
                            <i class="fas fa-check-circle text-green-500 mt-1 mr-3"></i>
                            <span>实时验证与错误高亮，加速调试</span>
                        </li>
                        <li class="flex items-start">
                            <i class="fas fa-check-circle text-green-500 mt-1 mr-3"></i>
                            <span>一站式平台，覆盖所有JSON处理需求</span>
                        </li>
                    </ul>
                </div>
            </div>
        </div>
    </section>

    <!-- Features Section -->
    <section id="features" class="py-20 bg-gray-50">
        <div class="container mx-auto px-6">
            <div class="text-center mb-16">
                <h2 class="text-3xl md:text-4xl font-bold mb-4">核心功能</h2>
                <p class="text-xl text-gray-600 max-w-3xl mx-auto">全面的JSON处理工具集，满足开发者和数据分析师的各种需求</p>
                <div class="w-24 h-1 bg-indigo-500 mx-auto mt-4"></div>
            </div>
            
            <div class="grid md:grid-cols-2 lg:grid-cols-3 gap-8">
                <!-- Feature 1 -->
                <div class="bg-white p-8 rounded-xl shadow-md card-hover">
                    <div class="feature-icon rounded-full flex items-center justify-center text-white mb-6 mx-auto">
                        <i class="fas fa-code text-2xl"></i>
                    </div>
                    <h3 class="text-xl font-bold mb-3 text-center">格式化与验证</h3>
                    <p class="text-gray-600">一键美化JSON数据，自动校验语法错误并高亮问题位置，帮助开发者快速修复无效JSON。</p>
                </div>
                
                <!-- Feature 2 -->
                <div class="bg-white p-8 rounded-xl shadow-md card-hover">
                    <div class="feature-icon rounded-full flex items-center justify-center text-white mb-6 mx-auto">
                        <i class="fas fa-project-diagram text-2xl"></i>
                    </div>
                    <h3 class="text-xl font-bold mb-3 text-center">图形与表格视图</h3>
                    <p class="text-gray-600">将JSON数据转换为树状图或表格，直观展示嵌套结构，方便理解复杂数据的层级关系。</p>
                </div>
                
                <!-- Feature 3 -->
                <div class="bg-white p-8 rounded-xl shadow-md card-hover">
                    <div class="feature-icon rounded-full flex items-center justify-center text-white mb-6 mx-auto">
                        <i class="fas fa-not-equal text-2xl"></i>
                    </div>
                    <h3 class="text-xl font-bold mb-3 text-center">结构化与文本比较</h3>
                    <p class="text-gray-600">支持逐行文本比较和语义化结构比较（如BigInt、数组差异），快速定位两个JSON的差异。</p>
                </div>
                
                <!-- Feature 4 -->
                <div class="bg-white p-8 rounded-xl shadow-md card-hover">
                    <div class="feature-icon rounded-full flex items-center justify-center text-white mb-6 mx-auto">
                        <i class="fas fa-exchange-alt text-2xl"></i>
                    </div>
                    <h3 class="text-xl font-bold mb-3 text-center">CSV转换与jq支持</h3>
                    <p class="text-gray-600">支持JSON与CSV互转，集成jq查询语言，允许通过命令过滤和处理复杂JSON数据。</p>
                </div>
                
                <!-- Feature 5 -->
                <div class="bg-white p-8 rounded-xl shadow-md card-hover">
                    <div class="feature-icon rounded-full flex items-center justify-center text-white mb-6 mx-auto">
                        <i class="fas fa-file-import text-2xl"></i>
                    </div>
                    <h3 class="text-xl font-bold mb-3 text-center">数据导入导出</h3>
                    <p class="text-gray-600">支持从URL、文件或剪贴板导入JSON，生成的结果可导出为JSON或CSV，方便集成到其他工作流。</p>
                </div>
                
                <!-- Feature 6 -->
                <div class="bg-white p-8 rounded-xl shadow-md card-hover">
                    <div class="feature-icon rounded-full flex items-center justify-center text-white mb-6 mx-auto">
                        <i class="fas fa-bolt text-2xl"></i>
                    </div>
                    <h3 class="text-xl font-bold mb-3 text-center">高效的性能</h3>
                    <p class="text-gray-600">专为现代浏览器优化，处理速度快，界面响应灵敏，即使处理中等规模数据也能保持流畅体验。</p>
                </div>
            </div>
        </div>
    </section>

    <!-- Use Cases Section -->
    <section class="py-20 bg-white">
        <div class="container mx-auto px-6">
            <div class="text-center mb-16">
                <h2 class="text-3xl md:text-4xl font-bold mb-4">应用场景</h2>
                <p class="text-xl text-gray-600 max-w-3xl mx-auto">JSON4U.cn 在这些场景中表现尤为出色</p>
                <div class="w-24 h-1 bg-indigo-500 mx-auto mt-4"></div>
            </div>
            
            <div class="grid md:grid-cols-3 gap-8">
                <!-- Use Case 1 -->
                <div class="bg-indigo-50 p-8 rounded-xl">
                    <div class="flex items-center mb-4">
                        <div class="bg-indigo-100 p-3 rounded-full mr-4">
                            <i class="fas fa-server text-indigo-600"></i>
                        </div>
                        <h3 class="text-xl font-bold">API调试与验证</h3>
                    </div>
                    <p class="text-gray-700 mb-4">后端开发者在测试API时，可将响应JSON粘贴到JSON4U.cn，自动格式化并验证语法错误。</p>
                    <p class="text-gray-600 text-sm">例如，调试一个包含嵌套对象的API响应时，图形视图能清晰展示数据结构，快速定位字段缺失或格式错误。</p>
                </div>
                
                <!-- Use Case 2 -->
                <div class="bg-indigo-50 p-8 rounded-xl">
                    <div class="flex items-center mb-4">
                        <div class="bg-indigo-100 p-3 rounded-full mr-4">
                            <i class="fas fa-code-branch text-indigo-600"></i>
                        </div>
                        <h3 class="text-xl font-bold">数据差异对比</h3>
                    </div>
                    <p class="text-gray-700 mb-4">前端开发者在版本迭代中需要比较新旧API返回的数据。</p>
                    <p class="text-gray-600 text-sm">JSON4U.cn 的结构化比较功能可高亮显示字段变更（如新增键或值变化），无需逐行检查文本差异。</p>
                </div>
                
                <!-- Use Case 3 -->
                <div class="bg-indigo-50 p-8 rounded-xl">
                    <div class="flex items-center mb-4">
                        <div class="bg-indigo-100 p-3 rounded-full mr-4">
                            <i class="fas fa-chart-bar text-indigo-600"></i>
                        </div>
                        <h3 class="text-xl font-bold">数据分析与转换</h3>
                    </div>
                    <p class="text-gray-700 mb-4">数据分析师处理大型JSON数据集时，可用表格视图快速浏览数组数据。</p>
                    <p class="text-gray-600 text-sm">通过jq查询提取特定字段后导出为CSV，导入Excel进行进一步分析。</p>
                </div>
            </div>
        </div>
    </section>

    <!-- Comparison Section -->
    <section class="py-20 bg-gray-50">
        <div class="container mx-auto px-6">
            <div class="text-center mb-16">
                <h2 class="text-3xl md:text-4xl font-bold mb-4">为何选择JSON4U?</h2>
                <p class="text-xl text-gray-600 max-w-3xl mx-auto">与其他JSON工具相比的优势</p>
                <div class="w-24 h-1 bg-indigo-500 mx-auto mt-4"></div>
            </div>
            
            <div class="overflow-x-auto">
                <table class="min-w-full bg-white rounded-xl overflow-hidden shadow-md">
                    <thead class="bg-indigo-600 text-white">
                        <tr>
                            <th class="py-4 px-6 text-left">功能/工具</th>
                            <th class="py-4 px-6 text-center">JSON4U.cn</th>
                            <th class="py-4 px-6 text-center">json.cn</th>
                            <th class="py-4 px-6 text-center">JSONLint</th>
                            <th class="py-4 px-6 text-center">JSON Editor Online</th>
                        </tr>
                    </thead>
                    <tbody class="divide-y divide-gray-200">
                        <tr>
                            <td class="py-4 px-6 font-medium">多视图可视化</td>
                            <td class="py-4 px-6 text-center text-green-600"><i class="fas fa-check"></i></td>
                            <td class="py-4 px-6 text-center text-gray-400"><i class="fas fa-times"></i></td>
                            <td class="py-4 px-6 text-center text-gray-400"><i class="fas fa-times"></i></td>
                            <td class="py-4 px-6 text-center text-gray-400"><i class="fas fa-check"></i></td>
                        </tr>
                        <tr class="bg-gray-50">
                            <td class="py-4 px-6 font-medium">高级比较功能</td>
                            <td class="py-4 px-6 text-center text-green-600"><i class="fas fa-check"></i></td>
                            <td class="py-4 px-6 text-center text-gray-400"><i class="fas fa-times"></i></td>
                            <td class="py-4 px-6 text-center text-gray-400"><i class="fas fa-times"></i></td>
                            <td class="py-4 px-6 text-center text-gray-400"><i class="fas fa-times"></i></td>
                        </tr>
                        <tr>
                            <td class="py-4 px-6 font-medium">jq集成</td>
                            <td class="py-4 px-6 text-center text-green-600"><i class="fas fa-check"></i></td>
                            <td class="py-4 px-6 text-center text-gray-400"><i class="fas fa-times"></i></td>
                            <td class="py-4 px-6 text-center text-gray-400"><i class="fas fa-times"></i></td>
                            <td class="py-4 px-6 text-center text-gray-400"><i class="fas fa-times"></i></td>
                        </tr>
                        <tr class="bg-gray-50">
                            <td class="py-4 px-6 font-medium">无广告体验</td>
                            <td class="py-4 px-6 text-center text-green-600"><i class="fas fa-check"></i></td>
                            <td class="py-4 px-6 text-center text-red-500"><i class="fas fa-times"></i></td>
                            <td class="py-4 px-6 text-center text-red-500"><i class="fas fa-times"></i></td>
                            <td class="py-4 px-6 text-center text-green-600"><i class="fas fa-check"></i></td>
                        </tr>
                        <tr>
                            <td class="py-4 px-6 font-medium">免费使用</td>
                            <td class="py-4 px-6 text-center text-green-600"><i class="fas fa-check"></i></td>
                            <td class="py-4 px-6 text-center text-green-600"><i class="fas fa-check"></i></td>
                            <td class="py-4 px-6 text-center text-green-600"><i class="fas fa-check"></i></td>
                            <td class="py-4 px-6 text-center text-green-600"><i class="fas fa-check"></i></td>
                        </tr>
                    </tbody>
                </table>
            </div>
        </div>
    </section>

    <!-- Getting Started Section -->
    <section class="py-20 bg-white">
        <div class="container mx-auto px-6">
            <div class="text-center mb-16">
                <h2 class="text-3xl md:text-4xl font-bold mb-4">快速上手指南</h2>
                <p class="text-xl text-gray-600 max-w-3xl mx-auto">几步操作即可开始使用JSON4U.cn</p>
                <div class="w-24 h-1 bg-indigo-500 mx-auto mt-4"></div>
            </div>
            
            <div class="max-w-4xl mx-auto">
                <div class="mb-12">
                    <div class="flex items-start mb-6">
                        <div class="bg-indigo-600 text-white rounded-full w-10 h-10 flex items-center justify-center flex-shrink-0 mr-4 mt-1">
                            1
                        </div>
                        <div>
                            <h3 class="text-xl font-bold mb-2">访问网站</h3>
                            <p class="text-gray-700">打开浏览器，访问 <a href="https://json4u.cn/editor" class="text-indigo-600 underline">https://json4u.cn/editor</a></p>
                        </div>
                    </div>
                </div>
                
                <div class="mb-12">
                    <div class="flex items-start mb-6">
                        <div class="bg-indigo-600 text-white rounded-full w-10 h-10 flex items-center justify-center flex-shrink-0 mr-4 mt-1">
                            2
                        </div>
                        <div>
                            <h3 class="text-xl font-bold mb-2">输入JSON数据</h3>
                            <p class="text-gray-700 mb-4">在左侧编辑器中粘贴JSON字符串，或点击"导入"按钮从文件、URL或剪贴板加载数据。</p>
                            <div class="bg-gray-800 text-gray-100 p-4 rounded-lg overflow-x-auto">
                                <pre><code class="language-json">{"name": "John", "age": 30, "skills": ["Python", "JavaScript"]}</code></pre>
                            </div>
                        </div>
                    </div>
                </div>
                
                <div class="mb-12">
                    <div class="flex items-start mb-6">
                        <div class="bg-indigo-600 text-white rounded-full w-10 h-10 flex items-center justify-center flex-shrink-0 mr-4 mt-1">
                            3
                        </div>
                        <div>
                            <h3 class="text-xl font-bold mb-2">格式化与验证</h3>
                            <p class="text-gray-700">点击"格式化"按钮，工具会自动美化JSON并检查语法错误。如有错误，右侧会高亮显示问题位置及错误描述。</p>
                        </div>
                    </div>
                </div>
                
                <div class="mb-12">
                    <div class="flex items-start mb-6">
                        <div class="bg-indigo-600 text-white rounded-full w-10 h-10 flex items-center justify-center flex-shrink-0 mr-4 mt-1">
                            4
                        </div>
                        <div>
                            <h3 class="text-xl font-bold mb-2">切换视图模式</h3>
                            <p class="text-gray-700">点击顶部"图形视图"或"表格视图"按钮，查看JSON的树状结构或表格形式。图形视图适合对象数据，表格视图适合数组数据。</p>
                        </div>
                    </div>
                </div>
                
                <div class="mb-12">
                    <div class="flex items-start mb-6">
                        <div class="bg-indigo-600 text-white rounded-full w-10 h-10 flex items-center justify-center flex-shrink-0 mr-4 mt-1">
                            5
                        </div>
                        <div>
                            <h3 class="text-xl font-bold mb-2">比较JSON</h3>
                            <p class="text-gray-700">在右侧编辑器输入另一个JSON，点击"比较"按钮，选择"结构化比较"或"文本比较"，查看高亮的差异结果。</p>
                        </div>
                    </div>
                </div>
                
                <div class="">
                    <div class="flex items-start mb-6">
                        <div class="bg-indigo-600 text-white rounded-full w-10 h-10 flex items-center justify-center flex-shrink-0 mr-4 mt-1">
                            6
                        </div>
                        <div>
                            <h3 class="text-xl font-bold mb-2">使用jq查询</h3>
                            <p class="text-gray-700 mb-4">在jq输入框输入查询命令（如 <code class="bg-gray-100 px-2 py-1 rounded">.skills[]</code>），点击运行，提取特定字段。结果可直接复制或导出为JSON/CSV。</p>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </section>

    <!-- Data Flow Diagram -->
    <section class="py-20 bg-gray-50">
        <div class="container mx-auto px-6">
            <div class="text-center mb-16">
                <h2 class="text-3xl md:text-4xl font-bold mb-4">JSON4U数据处理流程</h2>
                <p class="text-xl text-gray-600 max-w-3xl mx-auto">可视化展示JSON4U如何转换和处理您的数据</p>
                <div class="w-24 h-1 bg-indigo-500 mx-auto mt-4"></div>
            </div>
            
            <div class="mermaid max-w-4xl mx-auto bg-white p-8 rounded-xl shadow-md">
                graph TD
                    A[原始JSON数据] --> B[格式化验证]
                    B --> C{查看方式}
                    C -->|图形视图| D[树状结构展示]
                    C -->|表格视图| E[表格形式展示]
                    B --> F[比较工具]
                    F --> G[结构化比较]
                    F --> H[文本比较]
                    B --> I[转换工具]
                    I --> J[JSON转CSV]
                    I --> K[CSV转JSON]
                    I --> L[jq查询处理]
                    D --> M[导出结果]
                    E --> M
                    G --> M
                    H --> M
                    J --> M
                    K --> M
                    L --> M
            </div>
        </div>
    </section>

    <!-- Call to Action -->
    <section class="py-20 bg-indigo-600 text-white">
        <div class="container mx-auto px-6 text-center">
            <h2 class="text-3xl md:text-4xl font-bold mb-6">准备好提升您的JSON处理效率了吗？</h2>
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            </a>
        </div>
    </section>

    <script>
        // 初始化Mermaid图表
        mermaid.initialize({
            startOnLoad: true,
            theme: 'default',
            flowchart: {
                useMaxWidth: true,
                htmlLabels: true,
                curve: 'basis'
            }
        });
    </script>
</body>
</html>
```